Environmental Engineering 100 Questions with Answers
1.
The horizontal tunnels constructed at a shallow depths along the banks of a river
to intercept the ground water table are called
A.
Canals B. Infiltration galleries
C.
Springs D. Lakes
Answer: Option B
2.
A
pipe sunk into ground to tap the underground water is called
A.
Open well B. Tube well
C.
Artesian well D. Deep well
Answer: Option B
3.
An
artesian spring is formed
A. When an aquifer gets exposed
in a valley against a vertical cut
B.
Due to continuous fault in a rock through which water
under under pressure comes out
C.
When a porous strata gets enclosed between two
impervious strata
D.
None of the above
Answer: Option C
4.
The
continuous flow of water may be expected from
A. Surface springs
B.
Artesian
springs
C.
Gravity
springs
D.
All
of these
Answer: Option B
5.
The
water bearing strata i.e. layers of
sand, gravel etc. is called
A. An acquifer
B.
An
aquiclude
C.
An
aquifuge
D.
Zone
of saturation
Answer: Option A
6.
The
portion of soil through which lateral movement of water takes place is called
A. Water table
B.
An
aquiclde
C.
Zone
of saturation
D.
None
of these
Answer: Option C
7.
In
India, as per Indian standards, water consumption per capita per day for
domestic purpose is
A.
85 litres B. 100 litres
C.
115 litres D.
135 liters
Answer: Option D
8.
The
domestic use of water amounts to of the total water requirements per capita per
day.
A.
20% B. 30%
C.
40% D.
50%
Answer: Option D
9.
According
to Indian standards, the consumption of water per capita per day for nursing
homes, boarding schools and hostels is
A.
85 liters B. 100 liters
C.
115 liters D.
135 liters
Answer: Option D
10.
According to Indian standards, 45 liters of
water per person per day is provided in case of
A.
Hotels B. Hostels
C.
Offices D. All of these
Answer: Option C
11.
Freeman formula for estimating, the fire
demand (Q) in liters per minute is given by
A. Q = 1135(P/5+10)
B. Q = 2500(P/5+10)
C. Q = 3182√P
D. Q = 5663√P
Answer: Option A
12.
According to Kuichling formula, the fire
demand (Q) in liters per minute is given by
A. Q = 1135(P/5+10)
B.
Q
= 2500(P/5+10)
C.
Q
= 3182√P
D.
Q
= 5663√P
Answer: Option A
13.
For large cities, the suitable method for
forecasting population is
A. Arithmetical increase method
B.
Graphical
method
C.
Geometrical
increase method
D.
Comparative
method
Answer: Option A
14.
Suspended impurities consist of
A.
Iron B. Chlorine
C.
Bacteria D. All of these
Answer: Option C
15.
The presence of calcium and magnesium chloride
in water causes
A.
Softening B. Bad taste
C.
Hardness D. Turbidity
Answer: Option C
16.
The finely divided dispersion of solid
particles which are not visible to the naked eye and cannot be removed by
ordinary filters are known as
A. Suspended impurities
B.
Dissolved
impurities
C.
Colloidal
impurities
D.
None
of these
Answer: Option C
17.
The turbidity in water is caused due to
A. Silt
B.
Clay
C.
Finely
divided organic matter
D.
All
of these
Answer: Option D
18.
The presence of sodium chloride in water
A. Causes bad taste
B.
Softens
the water
C.
Increases
hardness of water
D.
Stop
epidemic
Answer: Option B
19.
The sodium carbonate in water
A. Causes bad taste
B.
Softens
the water
C.
Increases
hardness of water
D.
Stop
epidemic
Answer: Option B
20.
The presence of hydrogen sulphide in water
causes
A.
Softening B. Alkalinity
C.
Acidity D. Bad taste
Answer: Option C
21.
Turbidity of water is expressed in terms of
A. Silica scale
B.
Platinum
cabalt scale
C.
pO
value
D.
None
of these
Answer: Option A
22.
The odour of water can be determined by
A. Thermometer
B.
Osmoscope
C.
Jackson’s
turbidimeter
D.
None
of these
Answer: Option B
23.
The maximum permissible temperature for
domestic supply is
A. 5 to 100C
B. 10 to 150C
C. 15 to 200C
D. 20 to 250C
Answer: Option B
24.
The maximum permissible total solid content in
water for domestic in water for domestic purposes should not exceed
A.
300 ppm B. 400 ppm
C.
500 ppm D. 1000 ppm
Answer: Option C
25.
The maximum permissible chloride content in
water for domestic supplies should not exceed
A.
250 ppm B. 350 ppm
C.
450 ppm D. 550 ppm
Answer: Option A
26.
Residual chlorine in water is determined by
method
A.
Versenate B. Starch-iodide
C.
Both a and b D. None of these
Answer: Option B
27.
The
maximum acidity in water will occur at a pH value of
A.
0 B. 10-1
C.
10-7 D. 10-14
Answer: Option A
28.
The alkalinity in water is caused by
A. Sodium carbonate
B.
Potassium
carbonate
C.
Calcium
hydroxide
D.
All
the these
Answer: Option D
29.
The pH value of water for public supplies is
limited from
A. 2.5 to 6.5
B.
6.5
to 8
C.
8
to 10.5
D.
10.5
to 15
Answer: Option B
30.
The maximum permissible fluorine content in
water for domestic supplies should be
A.
0.15 ppm B. 1.5 ppm
C.
15 ppm D.
150 ppm
Answer: Option B
31.
B-coli or E-coli are harmless organisms but
their presence in water indicates the
A. Presence of pathogenic
B.
Absence
of pathogenic bacteria
C.
Presence
of non-pathogenic bacteria
D.
Absence
of non-pathogenic bacteria
Answer: Option A
32.
Bio-chemical oxygen demand(B.O.D) of safe
drinking water must be
A.
0 B. 10
C.
50 D.
100
Answer: Option A
33.
The method adopted for removing, bushes
branches, debries etc. from water is known as
A. Sedimentation
B.
Coagulation
C.
Screening
D.
Filteration
Answer: Option C
34.
In the process of screening, the screens
should be inclined at an angle of
A. 100 to 200
B. 300 to 400
C. 450 to 600
D. 700 to 850
Answer: Option C
35.
The area of the openings in screens should be
such that the velocity of flow through them does not exceed
A. 0.75 to 1 m/s
B.
1.5
to 3 m/s
C.
3
o 5 m/s
D.
5
to 6 m/s
Answer: Option A
36.
The detention time for an ordinary plain
sedimentation tank is
A. 1 to 2 hours
B.
2
to 4 hours
C.
6
to 8 hours
D.
20
to 24 hours
Answer: Option C
37.
In a plain sedimentation tank, under normal
conditions, impurities are removed upto
A.
50% B. 60%
C.
70% D. 80%
Answer: Option C
38.
The length of rectangular sedimentation tank
should not be more than the width of the tank.
A. Twice
B. Three times
C. Four times D. Six times
Answer: Option C
39.
The most common coagulant is
A. Magnesium sulphate
B.
Alum
C.
Chlorine
D.
Bleaching
powder
Answer: Option B
40.
The alum when mixed with water as a coagulant,
A. Does not effect pH value of
water
B.
Decreases
pH value of water
C.
Increases
pH value of water
D.
None
of these
Answer: Option B
41.
The organic impurities in water form a layer
on the top of a filtering media. Such a layer is called
A. Permeable layer
B. Filtering layer
C. Dirty skin
D. None of these
Answer: Option C
42.
The slow sand filter should be cleaned if the
loss of head becomes more than
A.
0.75 m B. 1.2 m
C.
2.2 m D.
3.5 m
Answer: Option B
43.
Slow sand filter is efficient to remove the
bacterias from the raw water to an extent of
A.
50% B. 70%
C.
85% D.
99%
Answer: Option D
44. An arrangement for back washing is provided in
A. Slow sand filter
B.
Sedimentation
tank
C.
Rapid
sand filter
D.
All
of these
Answer: Option C
45.
Rapid sand filter can remove bacterias upto an
extent of
A. 60% to 70%
B.
70%
to 80%
C.
80%
to 90%
D.
90%
to 99%
Answer: Option C
46.
Pressure filters, water is forced at a pressure the atmospheric pressure.
A. Swimming pools
B.
Railway
station
C.
Individual
industries
D.
All
of these
Answer: Option D
47. The
process of killing pathogenic bacterias from water is called
A. Sedimentation
B.
Filteration
C.
Coagulation
D. Disinfection
Answer: Option D
48. The most commonly used disinfectant for
drinking water throughout the world is
A.
Alum B. Nitrogen
C.
Lime D.
Chlorine
Answer: Option D
49. The
ideal method of disinfection of swimming pool water is by
A. Chlorination
B. Lime treatment
C. Ozonisation
D. Ultra-violet rays
Answer: Option C
50. The amount of residual chorine in
treated water is determined by the
A. Orthotolodine test
B.
Iodometric
test
C.
Amperometric
test
D.
All
of these
Answer: Option D
51. The time of contact for chlorination
should be at least
A.
5 minutes B. 20 minutes
C.
1 hour D. 2 hours
Answer: Option B
52. Pre-chlorination
A. Improves coagulation
B.
Reduces
odours
C.
Reduces
tastes
D.
All
of these
Answer: Option D
53. The process of dechlorination is followed
by
A. Plain chlorination
B.
Post-chlorination
C.
Dechlorination
D.
Super-chlorination
Answer: Option C
54. The
amount of chlorine used for plain-chlorination of water is about
A.
0.2 ppm B. 0.3 ppm
C.
0.4 ppm D.
0.5 ppm
Answer: Option D
55. The
most commonly used chemical for dechlorination of water is
A. Sodium thiosulphate
B.
Sodium
sulphite
C.
Potassium
permanganate
D.
All
of these
Answer: Option D
56. In orthotolodine
test, safe residual for drinking water is indicated by
A. Yellow colour
B.
Green colour
C.
Lemon yellow colour
D.
None of these
Answer: Option A
57.
Bleaching powder is
A. Slaked lime
B. Chloride of lime
C. Hypo-chloride of lime
D. Hypo-chlorite of lime
Answer: Option D
58.
The percentage of chlorine in fresh bleaching
powder is
A.20
to 25% B. 25 to 30%
C.
30 to 35% D. 35 to 40%
Answer: Option C
59. The
temporary hardness in water is caused due to the salts like
A.
Chlorides B. Nitrates
C.
Carbonates D. Sulphates
Answer: Option C
60. The
permanent hardness in water is caused due to the salts like
A.
Chlorides B. Nitrates
C.
Sulphates D. All of these
Answer: Option D
61.The temporary hardness due to calcium
bicarbonates can be removed by
A. Boiling
B. Lime process
C. Lime-soda process
D. Zeolite process
Answer: Option A
62. The permanent hardness of water can be removed by
A. Adding alum
B. Adding chlorine
C. Boiling
D. Zeolite process
Answer: Option D
63. The aeration of water is done to
remove
A.
Colour B. Odour
C.
Taste D. All of these
Answer: Option D
64. A reflux value is also known as
A. Safety value
B.
Scour
value
C.
Air
value
D.
Check
value
Answer: Option D
65. The minimum size of a fire hydrant is
A.
5 cm B. 10 cm
C.
15 cm D.
20 cm
Answer: Option C
66. The
value provided on the suction pipe in a tube well is
A.
Sluice value B. Air relief value
C.
Pressure relief value D. Reflux value
Answer: Option D
67. The
corrosion in pipe is due to
A. Dissolved oxygen in water
B. pH value of water
C.
Impurities
in the material particularly those having a lower potentential
D.
All of the above
Answer: Option D
68. The
plain ends of cast iron pipes are joined by
A. Spigot and socket joint
B.
Flanged
joint
C.
Victuallic
joint
D.
Dresser
coupling joint
Answer: Option D
69. In
order to control the flow of water through pipes, a is provided
A. Scour joint
B. Air value
C. Gate value
D. Safety value
Answer: Option C
70. The
suitable layout of a distribution system for well planned cities is
A. Dead end system
B.
Ring
system
C.
Radial
system
D.
Grid
iron system
Answer: Option B
71. The
water from kitchens, bathrooms, wash basins is called
A.
Sewer B. Sullage
C.
Raw sewage D. None of these
Answer: Option B
72. The
self cleaning velocity, recommended for Indian conditions, in order to prevent
setting down of sewage at the bottom or on the sides of a large sewer is
A.
0.25 m/s B. 0.50 m/s
C.
0.75 m/s D. 1.5 m/s
Answer: Option C
73.
According to Fanning’s formula, the quantity of storm water (Q) in liters per
second is given by
A.
Q = CA2/3
B. Q = CA5/8
C.
Q = CA3/4 D. Q = CA3/2
Answer: Option B
74. The
internal diameter of the sewer is small, then the velocity of flow will be high
A.
15 cm B. 25 cm
C.
50 cm D. 75 cm
Answer: Option A
75. For
house drainage and lateral connections, we shall use
A. Stone ware sewers
B. Cast iron sewers
C. Concrete sewers
D. Masonry sewers
Answer: Option A
76. The
cross-section recommended for separate system of sewerage is
A. Circular
B.
Egg-shaped
C.
Rectangular
D.
None
of these
Answer: Option A
77. Egg-shaped
sewers are generally used for
A. Separate system
B.
Combined
system
C.
Partially
separate system
D.
All of these
Answer: Option D
78. An egg-shaped cross-section of a sewer
A. Is economical than circular
cross-section
B.
Is
more stable than circular cross-section
C.
Provides
self cleaning velocity in dry weather
D.
None
of these
Answer: Option C
79. Manholes are, generally, located
A. At all changes of direction
B. At all changes of gradients
C. At all junctions of main and
branch sewers
D. All of these
Answer: Option D
80. The
minimum diameter of a manhole cover should be
A.
25 cm B. 50 cm
C.
75 cm D. 100 cm
Answer: Option B
81. A
drop manhole is provided if
A.
A
sewer drops from a height
B.
A branch sewer discharges into main sewer at a higher
level
C.
Both (a) and (b)
D.
None of these
Answer: Option B
82. A
good trap should
A. Not have self cleaning property
B. Restrict
the flow of water
C. Provide
an adequate water seal at all times
D. All
of these
Answer: Option C
83. A
pipe used to carry discharge from sanitary fitting like bathrooms, Kitchens
etc. is called
A.
Waste pipe B. Soil pipe
C.
Vent pipe D. Anti-siphonage
pipe
Answer: Option A
84. A
pipe installed for ventilation purpose is called
A.
Waste pipe B. Soil pipe
C.
Vent pipe D. Anti-siphonage pipe
Answer: Option C
85. The
anti-siphonage pipe is not required in
A. One pipe system
B.
Two
pipe system
C.
Single
stack system
D.
None
of these
Answer: Option C
86. The
activated sludge
A. Contains fertilizing constituents
B. Indicates the degree of
aeration
C. Indicates high water content
D. All of these
Answer: Option D
87. The
activated sludge process of sewage treatment
A. Requires smaller area for
construction of whole unit
B.
Requires
smaller water head for operation than trickling filters
C.
Has
high efficiency
D.
All
of the above
Answer: Option D
88. A septic tank is a
A.
Sedimentation
tank
B.
Digestion tank
C.
Combination of sedimentation and digestion tank
D.
Aeration tank
Answer: Option C
89. The
effluents from the septic tank are discharged into
A.
Soap pit B. Drainage
C.
Oxidation pond D. Sewer
Answer: Option A
90. The
minimum dissolved oxygen required in water to save the aquatic life is
A.
1 ppm B. 2 ppm
C.
4 ppm D. 8 ppm
Answer: Option C
91. The
amount of oxygen consumed by sewage from an oxidizing agent like potassium
dichromate is termed as
A. Bio-chemical oxygen demand
(B.O.D)
B. Chemical oxygen demand (C.O.D)
C. Relative stability
D. None of these
Answer: Option B
92. The
percentage ratio of the oxygen available in sewage to the oxygen required to
satisfy one stage of bio-chemical oxygen demand (B.O.D) is termed as
A.
Chemical
oxygen demand
B. Oxygen
consumed
C. Relative
stability
D. Bio-oxygen
demand
Answer: Option C
93. In
preliminary treatment of sewage, the operation which takes place, is
A. Removal of fine suspended
particles
B. Removal of fine dissolved
organic material
C. Removal of lighter floating
material
D. Removal of harmful bacterias
and other organisms
Answer: Option C
94. In
secondary treatment of sewage, the operation which takes place is
A. Removal of heavier suspended
inorganic material
B.
Removal
of fine dissolved organic material
C.
Removal
of harmful bacterias
D.
All
of the above
Answer: Option B
95. The
secondary treatment of sewage is carried out by the use of
A.
Screens B. Grit chambers
C.
trickling filters D. Chlorinators
Answer: Option C
96.
Biological action is used in
A.
Screens B. Sedimentation tanks
C.
Trickling filters D. All of these
Answer: Option C
97. The
sewage is treated by aerobic bacteria action in
A.
Settling tank B. Trickling filter
C.
Oxidation pond D. All of these
Answer: Option C
98. The
most common causes of acidity in water
A.
Oxygen B. Hydrogen
C.
Nitrogen D.
Carbon dioxide
Answer: Option D
99. Which
of the following is not a water borne disease
A.
Typhoid B. Malaria
C.
Cholera D.
Dysentery
Answer: Option B
100. Pressure
filters are used for
A.
Urban water supply B. Rural
water supply
C.
Ground Water D. Swimming Pools
Answer: Option D
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